HF-VHF communication frame synchronization system and method

A HF-VHF, synchronization system technology, applied in the fields of wireless communication and frame synchronization, can solve problems such as unfavorable communication system implementation, increased device resource requirements, occupation, etc., and achieves reduction of false synchronization probability, device resource reduction, and device resource reduction. Effect

Inactive Publication Date: 2012-03-28
XIDIAN UNIV
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Problems solved by technology

[0003] Signals transmitted through HF-VHF wireless channels are often affected by ionospheric disturbances, multipath effects, and frequency offsets, and with the continuous acceleration of urbanization and the rapid development of wireless communications, HF-VHF communications face many new challenges. Problems: Firstly, the increasingly crowded wireless signals significantly increase the wireless background noise; secondly, industrial noise and interference gradually occupy the HF-VHF frequency band; thirdly, the noise generated by vehicles such as vehicles is increasing day by day
In this method, a PN sequence is usually used as the frame synchronization sequence. In the current deteriorating wireless communication environment, although better frame synchronization performance can be obtained by increasing the length of the PN sequence, due to the increase in the correlation calculation length, the communication system The increase in the demand for device resources is not conducive to the realization of the communication system

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  • HF-VHF communication frame synchronization system and method
  • HF-VHF communication frame synchronization system and method
  • HF-VHF communication frame synchronization system and method

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Embodiment Construction

[0035] refer to figure 1 , the HF-VHF communication frame synchronization system of the present invention mainly consists of a framer, a correlator, a local PN sequence generator, a storage unit, a parallel decision device, an observation window, an average value processing unit, a large mapping unit, and a frame synchronization timing signal Generator and delay unit, where:

[0036] The framer repeats a PN sequence of length L M times to form a frame synchronization sequence, which is used as the initial part of each data frame, and control information or data is inserted behind the frame synchronization sequence to form a complete data frame and send it out ;

[0037] The correlator is connected with the local PN sequence generator, and the local PN sequence generated by the local PN sequence generator is used as the input of the correlator. The correlator performs correlation operation on the received signal and the local PN sequence, and quantifies the correlation result....

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Abstract

The invention discloses an HF-VHF communication frame synchronization system and a method, mainly solving the problems of excessive device resource consumption and poor frame synchronization performance of the existing frame synchronization method. The frame synchronization process of the invention is as follows: a PN sequence is repeated for M times at a transmitting terminal to form a frame synchronization sequence; then control information or data is inserted behind the frame synchronization sequence to form a whole data frame to be sent out; a receiving signal and the local PN sequence are performed with correlation operation on a receiving end by a correlator, and a correlation value is written into a storage unit; the storage unit outputs M paths of parallel correlation values to a parallel decision device; if M paths of parallel correlation values all reach a preset threshold, M observation windows whose length is N are opened, the average values of correlation values with sameposition in the window are calculated, and a frame synchronization timing signal is produced according to maximum value position in N average values; or capture is continued. The invention has the characteristics of small device resource consumption and favourable frame synchronization performance, and can be used in HF-VHF communication to realize frame synchronization.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to wireless communication technology, in particular to a frame synchronization method, which can be used to realize frame synchronization in HF-VHF communication. Background technique [0002] HF-VHF communication mainly uses the reflection and scattering of HF-VHF signals by channels such as ionosphere, discrete E layer, meteor trail and atmospheric waveguide to communicate, which is an important means of ground, aviation and marine communication. [0003] Signals transmitted through HF-VHF wireless channels are often affected by ionospheric disturbances, multipath effects, and frequency offsets, and with the continuous acceleration of urbanization and the rapid development of wireless communications, HF-VHF communications face many new challenges. Problem: First, the increasing congestion of wireless signals significantly increases wireless background noise; second, industrial noi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B7/26H04W56/00
Inventor 司江勃李赞权安郝本建王利鹏刘和碧张文博
Owner XIDIAN UNIV
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